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(No Model.)

i H. 17.5?. COOKE.

LUCK.

No. '6.36,'510.v Patented Mar. 26, 1895.

i to construct a lock of the kind describedY UNITED VSTATES l PATENT I OFFICE. v

HENRY v.,1 OOOKE, OE sr.` LOUIS, MISSOURI.

LOCK.

SPECIFICATION forming part of Letters Patent No. 536,510, dated March 26, 1895.

Application iiled June 9, 1894. Serial No. 513,986. (No model.) v

.To all whom it may concern;

Be it known that I, HENRY V. P. COOKE, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have `invented a certain new and useful Improvement in Locks, of which the following is a full, clear, and exact description, 'reference being had to the accompanying drawings, forming part of this specification, wherein-'- Figure lis a plan-view of my improved lock. Figs. 2 to 5 are plan-views, with part of the casing removed, and key-post shown in section, illustrating the different positions of the lock. Fig. 6 is a sectional view; Fig. 7, an elevational view of the key-post. Fig. 8 is a view of the individual or regular key; and Fig. 9 of a master or pass-key.

My invention relates to a new and useful improvement in locks, and particularly to that kind` generally used in-connection with safedeposit boxes, where a key, known as the individual or regular key, is retained by the depositor, and a passor master-key kept by the deposit company, both of which keys are required to operate a lock.

The essential feature of this invention is wherein two keys are required to open it, said lock having but a single key-post, which yis formed with a groove, which post operates in a cylinder which is formed with two grooves, whereby when the pass-key is inserted inthe post-groove and one of the cylinder grooves, it removes an obstruction which before had -closed the regular key way, or the other cylinder groove. The pass-key is then withdrawn and the regular key can be inserted to throw the tumblers and lock-bolt, as is common. To accomplish this, I provide an ordinarily-constructed lock with an additional tumbler, which' is so constructed as to normally close one of the key-ways,formed.by the registration of the, post-groove with one of the cylinder grooves, but which, upon the insertion and turning of a proper key, such as the pass-key, will be thrown out of the keyway formed by the post-groove registering with the other of Saidcylinder grooves of the regular key, and held in such inactive posi-v tion until the lock-bolt is thrown, when this obstruction-tumbler will be released, so as to be in position to obstructthe regular keyway upon the withdrawal of the regular key, thus preventing another insertion of the regular key until after the pass-key has operated upon this tumbler.

In the drawings, A indicates a suitable casing; B, the lock-bolt operating therein, said lock-bolt being provided with aprojection or fence C, which co-operates with suitable re.- 6o cesses in tumblers D.

E indicates the key-post, of ordinary construction, except that at the upper part of its reduced spindle it is recessed at e, to afford a seat for the obstruction tumbler, hereinafter described.

F indicates the removable portion of thev casing, and G,a nose or cylinder formed thereon, which cylinder is provided with two grooves, l and 2, to co-operate with the groove 7o in the key-post to form key-ways for the passkey and regular key.

Loosely mounted through the medium of a slot 3 upon the pivot 4 ofthe regular tumblers, is an obstruction-tumbler 5, which is recessed at its forward end, as at 6, which recess co-opcrates with the projection C on the lock-bolt.

7 indicates a lateral projection formed on the forward end of the tumbler 5, which, in the normal position of the tumbler, is adapted 8o to extend over and cover the regular key-hole, and which projection also forms a shoulder 8 in conjunction with the tumbler 5. In the normal position of the look, this obstructiontumbler is in the position shown in Fig. 2, that is, the projection 7 covers the regular key-way and the shoulder 8 seated in the recess e permits the pass-key to be inserted in the key-post and groove 2 until said pass-key is seated. This will raise the tumbler to the 9o position 'shown in Fig. 3, where its recess 6 is in alignment with the projection or fence C on 'the bolt. Upon'turning the pass-key, to the left in this instance, tumbler 5 is moved to the left, through the medium of the passkey operating upon shoulder 8. This Inovement to the left is permitted by slot 3, allowing a V'play between the tumbler and the pivotpost 4. The'tumbler being thus moved to the left, the recess 6 will include the projecroo tion or fence C in its path, and, upon the removal of the pass-key, the tumbler is held in an elevated position, or a position in which the projection 7 uncovers the regular key-way of the lock-bolt, the projection or fence C enters into the recesses in all the tumblers, and, as the tumbler 5 was thrown forward, in advance of its normal position, as shown in Fig. 4, the projection or fence C will come in contact with the bottom of the recess, as shown in Fig. 5, and force said tumbler 5 rearwardly. When the lock-bolt B is again thrown out, projection or fence C will leave the recesses in the several tumblers, and the obstruction-tumbler will be ready, through the medium of the spring 9, to again assume its position of obstruction to the passage of the regular key. After the bolt B has been once thrown, and the projection 7 is impinging against the regular key, as would be the case before the withdrawal of said key, the bolt cannot again be withdrawn because the recess 6 is not in alignment with the projection or fence C, and will not be in alignment with said projection until the pass-key is again inserted and operated as before described, thus making it absolutely necessary for the person carrying the pass-key to be present to unbolt a door upon which this lock may be applied before said lock can bc operated to open the door after its bolt has been once thrown.

I have shown the obstruction tumbler as being located on top of the regular tumblers, but, it is obvious, that, it desired, the same may be located in the center of a group, of regular tumblers, and that one or more obstruction tuinblers could be used, it only being necessary to so cut away the regular tuml blers as to permit the free turning to the left of the passkey.

I claim, and desire to secure by Letters Patent, is-

l. A lock having a single key-post operating in a cylinder, said post being formed with a single groove, and said cylinder being formed with two grooves, and two keys of different shapes which co-operate with the groove in the post and the grooves in the cylinder, only one of said keys being introduced at a time and in connection with but one of the cylinder grooves, saidkeys operating consecutively upon dierent parts of the lock mechanism, substantially as described.

2. In a lock the combination with the keypost, having a singlegroove, of a cylinder formed with two grooves, an obstruction turnbler, and two keys, one of which is to be inserted in the groove in the key-post and one of the grooves in the cylinder to throw the obstruction from the other groove in the cylinder, so as to permit the other key to be inserted in the other of said cylinder grooves, substantially as described.

3. In a lock, the combination with the keypost formed with a longitudinal groove and a recess e near the lower end of the groove, of a cylinder for said post, said cylinder being formed with two grooves, one to co-operate with the post-groove to permit the insertion of a pass-key, and the other to co-operate with the post-groove to permit the insertion of a regular key, and an obstruction tumbler formed with a projection which is adapted to be normally seated in the recess e to obstruct the passage of the regular key, which obstruction tumbler is operated by the insertion of the pass-key, substantially as described.

In testimony whereof I hereunto aflix my signature, in presence of two witnesses, this 29th day of May, 1894.

HENRY V. I. COOKE.

Vitnesses:

F. R. CORNWALL, HUGH K. WAGNER. 

